FRE-600: Fix code review blockers

- Consolidated duplicate UndoManagers to single instance
- Fixed connection promise to only resolve on 'connected' status
- Fixed WebSocketProvider import (WebsocketProvider)
- Added proper doc.destroy() cleanup
- Renamed isPresenceInitialized property to avoid conflict

Co-Authored-By: Paperclip <noreply@paperclip.ing>

node_modules/react-native/Libraries/StyleSheet/Rect.js

@@ -0,0 +1,27 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow strict
+ * @format
+ */
+
+export type Rect = Readonly<{
+  bottom?: ?number,
+  left?: ?number,
+  right?: ?number,
+  top?: ?number,
+}>;
+
+export type Insets = Rect;
+export type RectOrSize = Rect | number;
+
+export function createSquare(size: number): Rect {
+  return {bottom: size, left: size, right: size, top: size};
+}
+
+export function normalizeRect(rectOrSize: ?RectOrSize): ?Rect {
+  return typeof rectOrSize === 'number' ? createSquare(rectOrSize) : rectOrSize;
+}